Colourants - Import export

Coating colour recycling at paper and cardboard industries During the production of coated paper, it has to be cleaned with water and so, waste water results with pigments of the coating color. Because of their properties, exisiting precipitation plants are working hard on these types of waste waters. Alternatively to precipitation plants, membrane filtration technologies can be used to recover these high-value coating pigments. For that, the water with coating color pigments is circulated through the membrane plant until the required concentration is reached. The permeate is free of particles the CSB value is reduced significantly. It can know be handled by the precipitation plant, which is relief by the removing of the pigments. The concentrate with coating color pigments will be recirculated into the production process. Advantages: Reduction of coating color and pigments consumption Reduction of solid amounts in the waste water, which means reduction of operation costs

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